Heat treatment of reactor vessel completed for Rooppur NPP

Special Correspondent

12 February, 2021 12:00 AM printer

Heat treatment of reactor vessel completed for Rooppur NPP

Russian state-owned Rosatom has completed one of the key stages of Reactor Vessel manufacture for Unit No-2 of Rooppur Nuclear Power Plant (NPP) in Bangladesh.

After radiographic test Reactor Vessel weighing 320 tons was relocated to the gas furnace and six thermocouples were installed. The equipment was held in the furnace for three days at a temperature of 650 degrees Celsius, said a release.

 Modes of charge ranged from 10 to 650 degrees. The specialists recorded the readings of thermal detectors for three days. This is necessary to ensure a continuous process of thermal tempering of the Item. Heat treatment of the Reactor Vessel is required to relieve stress of welds and obtain the required mechanical properties of the metal.

A Reactor is an item of the safety class 1. It is a vertical cylindrical Vessel with an elliptical Bottom. A Core and Internals are located inside the Vessel. At the top, the Reactor is sealed with a Cover with drives of mechanisms and control and protection rods of Reactors and Nozzles for outputting cables of in-core monitoring sensors installed on it. A complete set of main equipment that includes Reactor and four Steam Generators for Unit No-1 of  Rooppur NPP was shipped to the Customer in 2020.

Rooppur NPP will consist of two Units with VVER-1200 Reactors, the operational life of which is 60 years with the possibility of extending the service life for 20 years.